Familial transmission of an unusual variant of a group C chromosome.
D000015:Abnormalities, Multiple / Q000235:genetics*; D000328:Adult; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D002906:Chromosomes, Human, 6-12 and X; D003434:Crossing Over, Genetic; D006801:Humans